CN115347284B - Battery manufacturing method and battery - Google Patents

Abstract

The present invention relates to the technical field of batteries, and proposes a battery manufacturing method and a battery. The battery manufacturing method comprises: providing a first shell, the first shell comprises a middle portion and a first flange edge, a first positioning portion is formed on the first flange edge; providing a second shell, a bottom wall and a side wall of the second shell, the side wall extends upward from the bottom wall, the side wall surrounds an opening, the side wall extends outward from the opening to form a second flange edge, a second positioning portion is formed on the second flange edge, the middle portion covers the opening, and the second flange edge contacts the first flange edge; positioning and aligning the first shell and the second shell through the first positioning portion and the second positioning portion; welding the first flange edge and the second flange edge. Before welding the first flange edge and the second flange edge, the first shell and the second shell can be quickly positioned and aligned through the first positioning portion and the second positioning portion, thereby improving the positioning efficiency of the first shell and the second shell and reducing the manufacturing time of the battery.

Description

Battery manufacturing method and battery

Technical Field

The present invention relates to the technical field of batteries, and in particular to a battery manufacturing method and a battery.

Background Art

The battery in the related art includes a battery cell and a shell assembly. After the battery cell is assembled, it is necessary to assemble the shell assembly, that is, to assemble the battery shell and the cover. Due to the structural limitations of the battery shell and the cover themselves, it is difficult to quickly align the two during the assembly process.

Summary of the invention

The invention provides a battery manufacturing method and a battery, so as to realize the rapid positioning and alignment of a first shell and a second shell.

According to a first aspect of the present invention, there is provided a battery manufacturing method, comprising:

Providing a first shell, the first shell comprising a middle portion and a first flange edge, and a first positioning portion is formed on the first flange edge;

A second shell is provided, the second shell includes a bottom wall and a side wall, the side wall extends upward from the bottom wall, the side wall surrounds an opening, the side wall extends outward from the opening to form a second flange edge, a second positioning portion is formed on the second flange edge, the middle portion covers the opening, and the second flange edge contacts the first flange edge;

Positioning and aligning the first shell and the second shell through the first positioning portion and the second positioning portion;

Weld the first flange side and the second flange side.

The battery manufacturing method of the embodiment of the present invention forms a first positioning portion and a second positioning portion on the first shell and the second shell respectively. Before welding the first flange edge and the second flange edge, the first shell and the second shell can be quickly positioned and aligned by the first positioning portion and the second positioning portion, thereby improving the positioning efficiency of the first shell and the second shell and reducing the manufacturing time of the battery.

According to a second aspect of the present invention, there is provided a battery, comprising a battery obtained by the above-mentioned battery manufacturing method.

The battery of the embodiment of the present invention includes a first shell and a second shell. Before welding the first shell and the second shell, a first positioning portion and a second positioning portion are formed on the first shell and the second shell. Before welding the first flange edge and the second flange edge, the first shell and the second shell can be quickly positioned and aligned by the first positioning portion and the second positioning portion, thereby improving the positioning efficiency of the first shell and the second shell and reducing the manufacturing time of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

FIG1 is a schematic flow chart of a method for manufacturing a battery according to an exemplary embodiment;

FIG2 is a schematic diagram of a process decomposition structure of a battery manufacturing method according to an exemplary embodiment;

3 is a schematic diagram of an exploded structure of a first shell and a second shell of a battery manufacturing method according to an exemplary embodiment;

FIG4 is a schematic structural flow diagram of a battery manufacturing method according to an exemplary embodiment;

FIG. 5 is a schematic diagram showing an exploded structure of a battery according to an exemplary embodiment.

The following are the descriptions of the reference numerals:

1. Flat plate; 10. First shell; 11. First flange edge; 111. First positioning portion; 12. First main body; 20. Second shell; 21. Second flange edge; 211. Second positioning portion; 22. Second main body; 30. Weld; 40. Accommodating cavity; 50. Battery cell; 51. Battery cell body; 52. Pole ear; 60. Pole column assembly.

DETAILED DESCRIPTION

The following will be combined with the drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and/or" includes any and all combinations of one or more associated listed items. In particular, reference to "the/the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

An embodiment of the present invention provides a battery manufacturing method. Referring to FIG. 1 , the battery manufacturing method includes:

S101, providing a first housing 10, wherein the first housing 10 comprises a middle portion and a first flange 11, and a first positioning portion 111 is formed on the first flange 11;

S103, providing a second housing 20, the second housing 20 comprising a bottom wall and a side wall, the side wall extending upward from the bottom wall, the side wall surrounding an opening, the side wall extending outward from the opening to form a second flange 21, a second positioning portion 211 being formed on the second flange 21, the middle portion covering the opening, the second flange contacting the first flange;

S105, aligning the first housing 10 and the second housing 20 by using the first positioning portion 111 and the second positioning portion 211;

S107 , welding the first flange edge 11 and the second flange edge 21 .

A battery manufacturing method according to an embodiment of the present invention forms a first positioning portion 111 and a second positioning portion 211 on a first shell 10 and a second shell 20, respectively. Before welding the first flange edge 11 and the second flange edge 21, the first shell 10 and the second shell 20 can be quickly positioned and aligned by the first positioning portion 111 and the second positioning portion 211, thereby improving the positioning efficiency of the first shell 10 and the second shell 20 and reducing the manufacturing time of the battery.

It should be noted that the first shell 10 includes a middle portion and a first flange 11, that is, the middle portion can be a plate structure, and the first flange 11 is arranged around the circumferential direction of the middle portion, and the first flange 11 is a circumferentially closed structure. In some embodiments, it is not excluded that a recess is formed in the middle portion, that is, the middle portion has an accommodating cavity 40.

The second shell 20 includes a bottom wall and a side wall, the side wall extends upward from the bottom wall, and the side wall surrounds an opening, that is, the second shell 20 forms a receiving cavity 40, the opening is the opening of the receiving cavity 40, and a second flange 21 is formed in the circumferential direction of the opening of the receiving cavity 40, and the second flange 21 is a circumferentially closed structure. The depth of the receiving cavity 40 of the second shell 20 can be greater than the depth of the receiving cavity 40 of the first shell 10.

It should be noted that, in combination with FIG. 2 and FIG. 3 , the first flange edge 11 of the first housing 10 and the second flange edge 21 of the second housing 20 are arranged relative to each other, so that the first positioning portion 111 on the first flange edge 11 and the second positioning portion 211 on the second flange edge 21 can be aligned. The first flange edge 11 and the second flange edge 21 do not form a battery accommodation space.

It should be noted that the first shell 10 and the second shell 20 are provided without front-to-back distinction.

The first flange edge 11 and the second flange edge 21 can be used for connecting the first shell 10 and the second shell 20 , that is, the connection between the first shell 10 and the second shell 20 is achieved by welding the first flange edge 11 and the second flange edge 21 .

Alternatively, the first flange edge 11 and the second flange edge 21 are used to form the first positioning portion 111 and the second positioning portion 211, so as to facilitate subsequent positioning and alignment. Optionally, on the basis of welding the first flange edge 11 and the second flange edge 21, the first main body 12 of the first shell 10 and the second main body 22 of the second shell 20 can be welded. For example, one of the first main body 12 and the second main body 22 is a plate, which is also convenient for welding the first main body 12 and the second main body 22. The first flange edge 11 can be arranged around the circumferential outer edge of the first main body 12, and the second flange edge 21 can be arranged around the circumferential outer edge of the second main body 22, that is, the first flange edge 11 and the second flange edge 21 can be a circumferentially closed structure. Of course, it is not excluded that the first flange edge 11 and the second flange edge 21 are a circumferentially open structure, as long as the first flange edge 11 and the second flange edge 21 can form corresponding first positioning portions 111 and second positioning portions 211. The first main body 12 includes a middle portion. The second main body 22 includes a bottom wall and a side wall.

In one embodiment, the first positioning portion 111 and the second positioning portion 211 are both positioning holes, that is, the positioning holes are formed in the middle of the first flange edge 11 and the second flange edge 21. During the positioning and alignment process of the first positioning portion 111 and the second positioning portion 211, a positioning pin can be inserted into the upper and lower positioning holes to complete the positioning. The structures of the two positioning holes can be consistent.

In one embodiment, as shown in FIG. 2 and FIG. 3 , the first positioning portion 111 and the second positioning portion 211 are both positioning notches, that is, positioning notches are formed at the edges of the first flange edge 11 and the second flange edge 21 . During the positioning and alignment process of the first positioning portion 111 and the second positioning portion 211 , a positioning pin can be inserted into the upper and lower positioning notches to complete the positioning. The structures of the two positioning notches can be consistent. The setting of the notch can also play a role in releasing stress when welding the first shell 10 and the second shell 20 .

In one embodiment, one of the first positioning portion 111 and the second positioning portion 211 is a positioning protrusion, and the other is a positioning recess. The positioning protrusion and the positioning recess are adapted to each other, so that the positioning protrusion and the positioning recess can be matched during the alignment process of the first shell 10 and the second shell 20, that is, the positioning can be completed. The positioning recess can be a groove with a bottom, of course, the positioning recess can also be a through hole, which is not limited here.

In one embodiment, the battery manufacturing method further includes: after welding the first flange edge 11 and the second flange edge 21, cutting at least part of the first flange edge 11 and the second flange edge 21 to remove at least part of the first positioning portion 111 and the second positioning portion 211. The first positioning portion 111 and the second positioning portion 211 are mainly used for positioning and alignment, so they can be removed after welding is completed, thereby reducing the length of the first flange edge 11 and the second flange edge 21, thereby reducing the circumferential occupied area of the battery. The first flange edge 11 and the second flange edge 21 can be cut by a laser cutting process.

It should be noted that the first flange edge 11 and the second flange edge 21 can be cut in one process, that is, the second flange edge 21 can be cut when the first flange edge 11 is cut. Of course, in some embodiments, it is not excluded that the first flange edge 11 and the second flange edge 21 are cut in two processes respectively.

Optionally, when the first shell 10 and the second shell 20 are welded via the first flange 11 and the second flange 21 , portions of the first flange 11 and the second flange 21 are cut, that is, a certain length of the first flange 11 and the second flange 21 is reserved.

Optionally, when the first shell 10 and the second shell 20 are welded through the first main body 12 and the second main body 22, the first flange 11 and the second flange 21 can be completely cut. Alternatively, a portion of the first flange 11 and the second flange 21 is cut, that is, a certain length of the first flange 11 and the second flange 21 is reserved, and the reserved first flange 11 and the second flange 21 can be used as heat dissipation fins, and of course can also be used as subsequent installation and positioning components, which is not limited here.

In one embodiment, as shown in FIG4 , the first flange edge 11 and the second flange edge 21 are welded to form a weld 30, and the weld 30 does not overlap with at least a portion of the first positioning portion 111, and the weld 30 does not overlap with at least a portion of the second positioning portion 211, thereby ensuring the welding quality, and the weld 30 will not be excessively cut when the first positioning portion 111 and the second positioning portion 211 are subsequently cut off. The weld 30 is a circumferentially closed structure, thereby ensuring the connection reliability of the first shell 10 and the second shell 20, and ensuring that a relatively closed space can be formed between the first shell 10 and the second shell 20.

In one embodiment, welding the first shell 10 and the second shell 20 includes: welding the first flange edge 11 and the second flange edge 21 to form a weld 30, that is, the first shell 10 and the second shell 20 are welded through the first flange edge 11 and the second flange edge 21, and the first flange edge 11 and the second flange edge 21 are partially cut off after welding is completed.

Optionally, the weld 30 is spaced apart from the first positioning portion 111, and the weld 30 is spaced apart from the second positioning portion 211, and cutting is performed between the weld 30 and the first positioning portion 111 and between the weld 30 and the second positioning portion 211 to remove the first positioning portion 111 and the second positioning portion 211. When welding the first flange edge 11 and the second flange edge 21, the first positioning portion 111 and the second positioning portion 211 need to be avoided, so that when partially cutting off the first flange edge 11 and the second flange edge 21 later, the first positioning portion 111 and the second positioning portion 211 can be completely cut off, and part of the weld 30 will not be cut off.

In one embodiment, at least one of the first shell 10 and the second shell 20 is formed with a receiving cavity 40 for receiving components such as battery cells.

The first shell 10 and the second shell 20 can be made of stainless steel or aluminum, which has good corrosion resistance and sufficient strength.

The thickness of the first shell 10 is consistent, which not only has strong structural stability but also facilitates processing. The thickness of the second shell 20 is consistent. The thickness of the first shell 10 can be equal to the thickness of the second shell 20.

Optionally, both the first shell 10 and the second shell 20 may be formed with a receiving cavity 40, and after the first shell 10 and the second shell 20 are docked, the battery cell is located in the cavity formed by the two receiving cavities 40. The depths of the receiving cavities 40 of the first shell 10 and the second shell 20 may be the same or different, which is not limited here.

Optionally, the first shell 10 is a plate, the second shell 20 is formed with a receiving cavity 40, and the battery cell is located in the receiving cavity 40. The arrangement of the plate can facilitate subsequent connection and has low processing difficulty.

In one embodiment, the accommodating cavity 40 is obtained by punching the flat plate 1, that is, by selecting a flat plate 1 and punching out the accommodating cavity 40 through a punching process, a supporting platform with a groove can be selected in the specific punching process, so that the accommodating cavity 40 can be formed by punching, that is, the first shell 10 or the second shell 20 is formed. The portion of the flat plate 1 that is not punched forms a flange edge.

Optionally, the first shell 10 is formed with an accommodating cavity 40, and the first positioning portion 111 is formed before stamping the flat plate 1, that is, the first positioning portion 111 can be first formed on the flat plate 1, and then the first shell 10 is stamped out through a stamping process. At this time, the segment located on the plane where the opening of the accommodating cavity 40 is located is the first flange edge 11 of the first shell 10.

Optionally, the first shell 10 is formed with an accommodating cavity 40, and the first positioning portion 111 is formed after the stamping of the flat plate 1, that is, the first shell 10 can be punched out through the flat plate 1 first, and at this time, the segment located on the plane where the opening of the accommodating cavity 40 is located is the first flange edge 11 of the first shell 10, and then the first positioning portion 111 is formed on the first flange edge 11.

Correspondingly, the second shell 20 is formed with a accommodating cavity 40, and the second positioning portion 211 is formed before stamping the flat plate 1, that is, the second positioning portion 211 can be first formed on the flat plate 1, and then the second shell 20 is stamped out through a stamping process. At this time, the segment located on the plane where the opening of the accommodating cavity 40 is located is the second flange edge 21 of the second shell 20.

Alternatively, the second shell 20 is formed with an accommodating cavity 40, and the second positioning portion 211 is formed after the stamping of the flat plate 1, that is, the second shell 20 can be punched out by the flat plate 1 first, and at this time, the segment located on the plane where the opening of the accommodating cavity 40 is located is the second flange edge 21 of the second shell 20, and then the second positioning portion 211 is formed on the second flange edge 21.

Optionally, the accommodating cavity 40 and the first positioning portion 111 on the first shell 10 are obtained by synchronously stamping the flat plate 1, that is, the flat plate 1 can be stamped simultaneously by two different stamping heads to form the first shell 10 with the first positioning portion 111. At this time, the first positioning portion 111 can be a hole, a notch or a protrusion, etc.

Correspondingly, the accommodating cavity 40 and the second positioning portion 211 on the second shell 20 are obtained by synchronously stamping the flat plate 1, that is, the flat plate 1 can be stamped simultaneously by two different stamping heads to form a second shell 20 with a second positioning portion 211. At this time, the second positioning portion 211 can be a hole, a notch or a protrusion, etc.

In one embodiment, as shown in FIG4 , a flat plate 1 is provided, and a second housing 20 is formed by stamping, and a second positioning portion 211 is formed on a second flange edge 21 of the second housing 20. A first housing 10 is formed, wherein the first housing 10 may be a plate body, and a first positioning portion 111 is formed on the first housing 10, and the first housing 10 and the second housing 20 are positioned by aligning the first positioning portion 111 and the second positioning portion 211, and the first housing 10 and the second housing 20 are welded to form a weld 30, and finally, a portion of the first flange edge 11 and the second flange edge 21 are cut off.

In one embodiment, at least two first positioning portions 111 are formed on the first flange edge 11 along the length direction of the first shell 10, and at least two second positioning portions 211 are formed on the second flange edge 21 along the length direction of the second shell 20; wherein the first positioning portions 111 and the second positioning portions 211 correspond one-to-one, thereby ensuring the positioning accuracy and further accelerating the positioning speed.

In one embodiment, the first shell 10 further includes a first main body 12, and the first flange 11 is arranged around the circumferential outer edge of the first main body 12. The second shell 20 further includes a second main body 22, and the second flange 21 is arranged around the circumferential outer edge of the second main body 22; wherein, the first flange 11 is located on opposite sides of the first main body 12 and is formed with first positioning portions 111, and is symmetrically arranged about the center line of the length direction of the first main body 12, and the second flange 21 is located on opposite sides of the second main body 22 and is formed with second positioning portions 211, and is symmetrically arranged about the center line of the length direction of the second main body 22. A plurality of first positioning portions 111 are symmetrically arranged on the first flange 11, and a plurality of second positioning portions 211 are symmetrically arranged on the second flange 21. When the first shell 10 and the second shell 20 are assembled, the first shell 10 and the second shell 20 can be easily and quickly aligned, which saves time and effort, and can improve the manufacturing efficiency of the battery.

Optionally, three first positioning portions 111 are formed on the first flange edge 11 along the length direction of the first shell 10 , and correspondingly, three second positioning portions 211 are formed on the second flange edge 21 along the length direction of the second shell 20 .

It should be noted that the length direction of the first shell 10 and the length direction of the second shell 20 both refer to the longer extending directions of the first shell 10 and the second shell 20 .

In one embodiment, before the first shell 10 and the second shell 20 are positioned and aligned, a battery cell is placed between the first shell 10 and the second shell 20 to seal the battery cell after the first flange edge 11 and the second flange edge 21 are welded, that is, the battery cell 50 is installed before the positioning of the first shell 10 and the second shell 20 is completed, thereby ensuring that the position of the battery cell 50 is fixed after the welding of the first shell 10 and the second shell 20 is completed.

In one embodiment, the battery cell 50 is a laminated battery cell, which is not only convenient to group, but also can be processed to obtain a longer battery. The battery cell 50 has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

Optionally, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet having electrical properties opposite to the first pole sheet, and a diaphragm sheet disposed between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

In one embodiment, as shown in FIG. 5 , the battery cell 50 includes a battery cell body 51 and a tab 52 , wherein the tab 52 extends from the battery cell body 51 in a length direction.

As shown in Figure 5, a pole assembly 60 is installed on the first shell 10 or the second shell 20. Before the first shell 10 and the second shell 20 are welded, the pole ear 52 is connected to the pole assembly 60, wherein the pole ear 52 and the pole assembly 60 can be directly connected, that is, the pole ear 52 and the pole assembly 60 can be directly welded, or the pole ear 52 and the pole assembly 60 can be connected through a metal adapter. The specific connection method can be welding, and riveting and other methods are not excluded, which is not limited here.

It should be noted that the battery body 51 includes more than two pole pieces, and the pole ear 52 includes more than two single-piece pole ears, which extend from the corresponding pole pieces respectively, and the width of the single-piece pole ear is smaller than the width of the pole piece. Multiple single-piece pole ears are stacked to form the pole ear 52, and connected to the pole column assembly 60, wherein the pole ear 52 can be welded to the pole column assembly 60. The single-piece pole ear is made of metal foil with good electrical and thermal conductivity, such as aluminum, copper or nickel.

In some embodiments, there are two pole assemblies 60, which are respectively a positive pole assembly and a negative pole assembly. There are also two pole ears 52, which are respectively a positive pole ear and a negative pole ear. The positive pole assembly is connected to the positive pole ear, and the negative pole assembly is connected to the negative pole ear.

It should be noted that the above welding can be any one of laser welding, ultrasonic welding and resistance welding.

An embodiment of the present invention further provides a battery, as shown in FIG5 , the battery includes a battery obtained by the above-mentioned battery manufacturing method.

A battery according to an embodiment of the present invention includes a first shell body 10 and a second shell body 20. Before welding the first shell body 10 and the second shell body 20, a first positioning portion 111 and a second positioning portion 211 are formed on the first shell body 10 and the second shell body 20. Before welding the first shell body 10 and the second shell body 20, the first shell body 10 and the second shell body 20 can be quickly positioned and aligned by the first positioning portion 111 and the second positioning portion 211, thereby improving the positioning efficiency of the first shell body 10 and the second shell body 20 and reducing the manufacturing time of the battery.

Optionally, the battery is an approximately rectangular structure, that is, when errors in processing and manufacturing are ignored, the battery can be a rectangular structure.

In one embodiment, the length of the battery is a, 400 mm ≤ a ≤ 2500 mm, the width of the battery is b, the height of the battery is c, 2b ≤ a ≤ 50b, and/or, 0.5c ≤ b ≤ 20c.

Furthermore, 50mm≤b≤200mm, 10mm≤c≤100mm.

Preferably, 4b≤a≤25b, and/or, 2c≤b≤10c.

The battery in the above embodiment, while ensuring sufficient energy density, has a large ratio between the length and width of the battery, and further, has a large ratio between the width and height of the battery.

In one embodiment, the length of the battery is a, the width of the battery is b, the height of the battery is c, 4b≤a≤7b, and/or, 3c≤b≤7c.

In one embodiment, the length of the battery is a, the width of the battery is b, 4b≤a≤7b, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery module.

In one embodiment, the height of the battery is c, 3c≤b≤7c, and the ratio of the battery width to the height is relatively large, which is convenient for formation while ensuring sufficient energy density.

Optionally, the length of the battery may be 500 mm-1500 mm, the width of the battery may be 80 mm-150 mm, and the height of the battery may be 15 mm-25 mm.

It should be noted that the length of the battery is the dimension of the battery in the length direction, the width of the battery is the dimension of the battery in the width direction, and the height of the battery is the dimension of the battery in the height direction, that is, the thickness of the battery. The battery has a length direction and a width direction, and both the length direction and the width direction are linear directions. The length direction can be the longer extension direction of the battery, and the width direction can be the shorter extension direction of the battery. The height direction can be the thickness direction of the battery.

Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the inventions disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims (11)

1. A battery manufacturing method is characterized in that the length of the battery is a, a is more than or equal to 400mm and less than or equal to 2500mm, and the battery manufacturing method comprises the following steps:

Providing a first housing (10), the first housing (10) comprising an intermediate portion and a first flange edge (11), the first flange edge (11) having a first positioning portion (111) formed thereon;

Providing a second shell (20), wherein the second shell (20) comprises a bottom wall and a side wall, the side wall extends upwards from the bottom wall, the side wall surrounds an opening, the side wall extends outwards from the opening to form a second flange edge (21), a second positioning part (211) is formed on the second flange edge (21), the middle part covers the opening, and the second flange edge is contacted with the first flange edge;

positioning and aligning the first housing (10) and the second housing (20) by the first positioning portion (111) and the second positioning portion (211);

A battery cell is arranged between the first shell (10) and the second shell (20), the battery cell comprises a battery cell main body and a pole lug, a pole column assembly is arranged on the large surface of the first shell (10) or the large surface of the second shell (20), and the pole lug is connected with the pole column assembly;

-welding the first flange edge (11) and the second flange edge (21).

2. The battery manufacturing method according to claim 1, characterized by further comprising:

After welding the first flange edge (11) and the second flange edge (21),

-Cutting at least part of the first flange edge (11) and the second flange edge (21) to remove at least part of the first positioning portion (111) and the second positioning portion (211).

3. The battery manufacturing method according to claim 2, characterized in that welding the first flange side (11) and the second flange side (21) forms a weld (30), the weld (30) being misaligned with at least part of the first positioning portion (111), the weld (30) being misaligned with at least part of the second positioning portion (211).

4. A battery manufacturing method according to claim 3, characterized in that the weld (30) is provided at a distance from the first positioning portion (111), the weld (30) is provided at a distance from the second positioning portion (211), and cutting is performed between the weld (30) and the first positioning portion (111) and between the weld (30) and the second positioning portion (211) to remove the first positioning portion (111) and the second positioning portion (211).

5. The battery manufacturing method according to claim 1, wherein the first positioning portion (111) and the second positioning portion (211) are positioning holes; or, the first positioning part (111) and the second positioning part (211) are positioning notches; or, one of the first positioning part (111) and the second positioning part (211) is a positioning protrusion, and the other is a positioning recess, and the positioning protrusion is matched with the positioning recess.

6. The battery manufacturing method according to claim 1, wherein the second housing (20) is formed with a receiving chamber (40); the housing chamber (40) is obtained by stamping a flat plate (1);

the housing cavity (40) and the second positioning part (211) are obtained by synchronously stamping the flat plate (1).

7. The battery manufacturing method according to claim 1, wherein at least two first positioning portions (111) are formed on the first flange side (11) along the length direction of the first case (10), and at least two second positioning portions (211) are formed on the second flange side (21) along the length direction of the second case (20);

the first positioning parts (111) and the second positioning parts (211) are in one-to-one correspondence.

8. The battery manufacturing method according to claim 7, characterized in that the second flange edge (21) is arranged around the circumferential outer edge of the opening;

The first flange edges (11) are located on two opposite sides of the middle portion, are respectively provided with a first positioning portion (111), and are symmetrically arranged about the central line of the middle portion in the length direction, the second flange edges (21) are located on two opposite sides of the bottom wall, are respectively provided with a second positioning portion (211), and are symmetrically arranged about the central line of the bottom wall in the length direction.

9. The method of manufacturing a battery according to claim 1, characterized in that the cell is sealed after welding of the first flange edge (11) and the second flange edge (21).

10. A battery comprising a battery obtained by the battery manufacturing method according to any one of claims 1 to 9.

11. The cell of claim 10, wherein the cell has a width b and a height c,2 b.ltoreq.a.ltoreq.50b, and/or 0.5 c.ltoreq.b.ltoreq.20c.